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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96324ac1ba39c96f1143bd8f4c48d2e92a07bb415badc95a09b7ec40569cb8e6' 
  AND token = 'FR2/9bt6VTX9lhc8gKEH8TvWaU5QlJ/+iQkzkfFV14o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}